RDMA/hw/qib/qib_rc: Fix some worthy kernel-docs demote hardly complete one

Fixes the following W=1 kernel build warning(s):

 drivers/infiniband/hw/qib/qib_rc.c:216: warning: Function parameter or member 'flags' not described in 'qib_make_rc_req'
 drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'aeth' not described in 'do_rc_ack'
 drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'val' not described in 'do_rc_ack'
 drivers/infiniband/hw/qib/qib_rc.c:1008: warning: Function parameter or member 'rcd' not described in 'do_rc_ack'
 drivers/infiniband/hw/qib/qib_rc.c:1274: warning: Function parameter or member 'rcd' not described in 'qib_rc_rcv_resp'
 drivers/infiniband/hw/qib/qib_rc.c:1497: warning: Function parameter or member 'rcd' not described in 'qib_rc_rcv_error'

Link: https://lore.kernel.org/r/20210121094519.2044049-15-lee.jones@linaro.org
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>